Isobutylmercaptan

Synonym(s):Isobutyl mercaptan

CAS NO.：513-44-0
Empirical Formula: C4H10S
Molecular Weight: 90.19
MDL number: MFCD00004882
EINECS: 208-162-6
SAFETY DATA SHEET (SDS)
Update Date: 2025-09-25 17:15:13

What is Isobutylmercaptan?

Chemical properties

Liquid; unpleasant odor.

Chemical properties

2-Methyl-1-propanethiol has a cooked vegetable, almost mustard-like, odor

Occurrence

Reported found in guava, milk, cooked beef, cooked pork and beer.

The Uses of Isobutylmercaptan

Flammable, dangerous fire risk.

What are the applications of Application

2-Methyl-1-propanethiol is used in the study of drug delivery and self-assembling monolayers

General Description

2-methyl-1-propanethiol attaches with L-Cys (the carrier) via a disulfide bond to form the brain-targeted drug delivery systems (BTDS).

Purification Methods

Dissolve the thiol in EtOH, and add to 0.25M Pb(OAc)2 in 50% aqueous EtOH. The precipitated lead mercaptide is filtered off, washed with a little EtOH, and impurities are removed from the molten salt by steam distillation. After cooling, dilute HCl is added dropwise to the residue, and the mercaptan is distilled directly from the flask. Water is separated from the distillate, and the mercaptan is dried (Na2CO3) and distilled under nitrogen. [Mathias J Am Chem Soc 72 1897 1950, Beilstein 1 H 378, 1 I 191, 1 II 412, 1 III 1565, 1 IV 1605.]

Properties of Isobutylmercaptan

Melting point:	-145°C
Boiling point:	87-89 °C(lit.)
Density	0.831 g/mL at 25 °C(lit.)
vapor density	3.1 (vs air)
vapor pressure	124 mm Hg ( 37.8 °C)
FEMA	3874 \| 2-METHYL-1-PROPANETHIOL
refractive index	n20/D 1.4385(lit.)
Flash point:	15 °F
solubility	H2O: slightly soluble
form	liquid
pka	10.41±0.10(Predicted)
color	Colorless to Light yellow
Odor	at 0.10 % in propylene glycol. cooked vegetable mustard
Odor Threshold	0.0000068ppm
JECFA Number	512
Merck	14,5147
BRN	1730890
CAS DataBase Reference	513-44-0(CAS DataBase Reference)
NIST Chemistry Reference	1-Propanethiol, 2-methyl-(513-44-0)
EPA Substance Registry System	1-Propanethiol, 2-methyl- (513-44-0)

Safety information for Isobutylmercaptan

Signal word	Danger
Pictogram(s)	Flame Flammables GHS02 Exclamation Mark Irritant GHS07
GHS Hazard Statements	H225:Flammable liquids H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.